Water Pump Commit

Units:	-
Mode:	Input Only
Multi-band:	False
Default Value:	-1
Validation Rule:	≥-1
Key Property:	No
Description:	Number of units that should be committed
Detail:

WaterPump Commit predetermines or 'hardwires' the unit commitment either in all periods or selected periods. Commit specifies the number of units that (if available) should be committed. A value of -1 for any period means the unit commitment is to be optimized in the usual way. It is acceptable to mix -1 with non-negative values if you wish to set the commitment pattern only in certain time periods.

As with any property its value can change by date and pattern and scenario, and even be read from a flat text file. Note that any non-negative value of Commit is hard constraint e.g. a value of zero means no units are allowed to be committed. If you want to set a minimum unit commitment instead of a fixed commitment, use the Must Run Units property.

Water Pumps with the Commit property defined require less unit commitment overhead in the optimization. This provides the simulation with a significant computational boost, and hence it is desirable to set this for all 'baseload' water pumps, or other water pumps with fixed or semi-fixed commitment schedules. Commit is ignored when a unit is out of service so there is no need to account for outages when defining the property. Note however that Commit overrides other constraints such as Min Down Time and Min Up Time i.e. if you define Commit = 1 a unit will be committed if available regardless of whether or not Min Down Time gets violated and vice versa for Min Up Time.